Preparation And Repairing Properties Of Luminescent Material/polymer Composite Films Based On Self-healing Polymers

Organic luminescent materials and inorganic luminescent materials emit light when exposed to external excitation（photo-,thermal and mechanical excitation）.This characteristic is widely used in solid-state lighting,flat panel displays,flexible screens and anti-counterfeiting displays.Both organic luminescent materials and inorganic luminescent materials are in the form of solution or powder,so they cannot achieve self-support.In practical applications,they need to be combined with other polymer materials to form luminescent material composite device.The luminescent material composite device is prone to fracture or damage during use,and such damage is difficult to repair,which will further cause the integrity of the device structure and luminescent properties of the device to be greatly damaged.Therefore,the irrecoverability of the luminescent material composite devices after being damaged greatly restricts the further development of organic luminescent materials and inorganic luminescent materials.The self-repairing polymer repair themselves after being broken or damaged.Inspired by it,in this article,we realized the structure self-repairing and pattern reconstruction of the luminescent material composite after cracking by combining organic or inorganic luminescent materials with self-repairing polymers.The main research content includes three parts:（1）We combined the organic luminescent material sulfone fluorescein with the self-repairing polymer PDMS-MPU_0.4-IU_0.6 to prepare a self-repairing sulfone fluorescein/polymer composite film,and studied the effect of the doping concentration of sulfone fluorescein to the photoluminescence and self-repairing properties of the composite film;（2）We solved the problem of the agglomeration of inorganic luminescent materials in the self-repairing polymer,studying the effect of agglomeration of the fluorescent powder to the self-repairing properties of the composite films by compare the tensile properties of the composite films which the phosphor was agglomerated in the polymer and the composite film which the phosphor was uniformly dispersed in the polymer;（3）Combining the inorganic luminescent material Sr Al₂O₄:Eu²⁺（SAOE）and Na Nb O₃:Pr³⁺（NNOP）with the self-repairing polymer PDMS-MPU_0.4-IU_0.6 to prepare the self-repairing SAOE/polymer composite film and NNOP/polymer composite film,respectively,and studied the luminescent properties and self-repairing properties of phosphor/polymer composite films.Designing a reconstruction experiment of luminescent pattern.The article has achieved the following research results:1.In the research of combining organic luminescent materials with self-repairing polymers,the self-repairing sulfone fluorescein/polymer composite film prepared by combining sulfone fluorescein with PDMS-MPU_0.4-IU_0.6 has excellent photoluminescence and self-repairing properties.The concentration of sulfone fluorescein with a mass ratio of 0.001%is the best doping concentration.When the concentration is higher than this,the self-repairing properties of the composite film will be greatly reduced;when it is lower than this concentration,the luminescent intensity of the composite film will be reduced.2.In the experiment of combining inorganic luminescent materials and self-repairing polymer,we used dimethylformamide as a dispersant to solve the problem of agglomeration of inorganic luminescent materials in the polymer.The tensile properties and self-repairing properties of the composite film added with dimethylformamide as a dispersant are significantly higher than those of the composite film without added dispersant.3.The self-repairing SAOE/polymer composite film and NNOP/polymer composite film prepared by combining SAOE and NNOP phosphors with PDMS-MPU_0.4-IU_0.6 have photoluminescence,persistent luminescence,mechanoluminescence,and self-repairing properties.Based on the above properties,we successfully realized the reconstruction of the luminescent pattern.These results are expected to provide new insights for designing multifunctional self-repairing and reconstructing composites for anti-counterfeiting,integrated optics,optical communications,and artificial skins.